Singleton usually involves being able to use 4 total but only 1 of each version (ex 1 tynamo NVI 38, 1 NVI 39, 1 DE), is usually unlimited to make up for the low amounts of, say, thyphlosions in print, and often has larger decks (100 cards) but that one's pretty optional. DP on would be interesting but I'd have to learn every card pre-HGSS. BW-on is a lot of fun. Another suggestion is Professor cup. But out of those 3 my vote would be BW-On